Robert C. Reamer (1873–1938) was an American
architect, most noted for the
Old Faithful Inn in
Yellowstone National Park. Reamer was born in and spent his early life in
Oberlin, Ohio. He left home at the age of thirteen and went to work in an architect's office in
Detroit as a
draftsman. By the age of twenty-one, Reamer had moved to
San Diego and had opened the architectural office of Zimmer & Reamer in partnership with Samuel B. Zimmer. The firm produced a wide variety of projects, but the only surviving example of Zimmer & Reamer's work is the George H. Hill Block in the
Gaslamp District. The partnership dissolved in 1898, but Reamer continued to work on his own, including work at the
Hotel del Coronado. During this period he became acquainted with the president of the Yellowstone Park Company,
Harry W. Child.